Wish I kept my box...I'm missing the VGA/DVI adapter and I very well think I might have thrown it away foolishly with the box. Keep the box! It's good for reselling.
I threw out an iMac box, then about six months later I had to move it back and forth to my brothers school until they got a mac. And that took awhile. Ugh, its hard transporting an iMac, without a box, without damaging it. He could've used one of the schools PCs for the first week or two...
SG
I keep it, it helps the resale value a lot ($30+). I won't buy a used Mac if it doesn't have the original packaging. Although, keeping my eMac box is starting to upset some people, since it takes up half the garage.